I'm self-learning on a keyboard piano so i need guidance on how to create a simple melody with chords? I have seen some people playing a melody phrase and i see the chords does change here and there but with the same major/minor? For example, my chord is C major. So i play a melody that have to match with the chord. At the same time, as i play the melody, can my C major chord change to A minor then back to C major since they are relative? What should I start first thing when I want to compose a song? Help greatly appreciated! ^^